How big is the pulley bolt on a Mazda Miata?
If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.) The pulley bolt shoulder diameter is 1.128 inches.
What’s the problem with the crankshaft on a Mazda Miata?
The new crankshaft is more robust. But when cars assembled in Hiroshima or repaired by trained Mazda dealers have crankshaft failures, it is clear that blame should not be laid entirely at the feet of the nearest shade tree mechanic. We have traced only two failures to the reversed key.
Why did Mazda change the crankshaft in 1991?
The factory claims the mid-year change in 1991 was to “improve serviceability”. This is partially true. The new crankshaft is more robust. But when cars assembled in Hiroshima or repaired by trained Mazda dealers have crankshaft failures, it is clear that blame should not be laid entirely at the feet of the nearest shade tree mechanic.
Where to put the crankshaft key on a Miata?
If the tip of the crankshaft is closer to 1/2 inch back in there, you have the dreaded short nose part. Withdraw the key with needle nose pliers. Make note of the chamfered corner, it should be on the back of the key and face toward the crankshaft. The key should not be bent, deformed, or mooshed.
If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.) The pulley bolt shoulder diameter is 1.128 inches.
The new crankshaft is more robust. But when cars assembled in Hiroshima or repaired by trained Mazda dealers have crankshaft failures, it is clear that blame should not be laid entirely at the feet of the nearest shade tree mechanic. We have traced only two failures to the reversed key.
What to do when you remove timing belt on Miata?
If you do happen to remove the belts before loosening the water pump pulley bolts, you can hold the pulley in place by wrapping the belt back around the pulley and holding it tightly, as close to the pulley as possible. Remove the Alternator belt. Loosen the alternator tensioner bolts. The bottom bolt can be difficult to get to.
The factory claims the mid-year change in 1991 was to “improve serviceability”. This is partially true. The new crankshaft is more robust. But when cars assembled in Hiroshima or repaired by trained Mazda dealers have crankshaft failures, it is clear that blame should not be laid entirely at the feet of the nearest shade tree mechanic.
How do you remove an idler pulley from a car?
Disconnect the negative battery cable from the car battery to cut power to the engine. Set the cable aside where it cannot make contact with anything metal. Step 2: Remove the drive belt. To remove the drive belt, first release the tension to the belt.
What causes a pulley bolt to lose its keyway?
Typically, the key wears the keyway slot in the crankshaft nose. Worn keyways are not repairable. In other cases, the pulley bolt will fail to stay tightly screwed to the front of the crankshaft. Insufficient tightening torque upon assembly is an obvious cause.
Can a worn pulley bolt on a crankshaft be repaired?
Typically, the key wears the keyway slot in the crankshaft nose. Worn keyways are not repairable. In other cases, the pulley bolt will fail to stay tightly screwed to the front of the crankshaft.
How does a crank pulley holder work on a Mazda 3?
7) when the bolt is turned 90 degrees, it stretches to flatten the cone of the to seal the front of the engine. 8) remove bolts, to hold everything in place. Mazda says dont use an impact, but if your in a bind, it does work. Not the prefrred method though.
What happens when the crank pulley holder is turned 90 degrees?
7) when the bolt is turned 90 degrees, it stretches to flatten the cone of the to seal the front of the engine. 8) remove bolts, to hold everything in place.
Do you need a pulley holder for a crank?
Didn’t have to use a pulley holder. The washer should be between the crank and the sprocket and the sprocket and the pulley. These washers are crushed when you tigten the assembly. The bite into the pulley sprocket and crank keeping everything in place. They use these instead of a crank key.